burial chamber vs crypt

burial chamber and crypt both are nouns.

Word	Noun	Adjective	Verb	Adverb
burial chamber	Yes	No	No	No
crypt	Yes	No	No	No

As nouns, crypt is a hyponym of burial chamber; that is, crypt is a word with a more specific, narrower meaning than burial chamber:

burial chamber: a chamber that is used as a grave
crypt: a cellar or vault or underground burial chamber (especially beneath a church)

Other hyponyms of burial chamber include mausoleum, monument, repository, burial vault, vault.

burial chamber (noun)	crypt (noun)
a chamber that is used as a grave	a cellar or vault or underground burial chamber (especially beneath a church)